SAE AMS 6395E pdf download

SAE AMS 6395E pdf download.Steel Sheet,Strip, and Plate 0.95Cr – 0.20Mo (0.38- 0.43C)(SAE 4140).
1.1 Form:
This specification covers an aircraft-quality, low-alloy steel in the form of sheet, strip, and plate.
1.2 Application:
These products have been used typically for heat treated parts, 0.875 inch (22.22 mm) and under in section thickness at time of heat treatment, requiring through-hardening to a minimum tensile strength of 180 ksi (1241 MPa) and proportionately lower strength in heavier thicknesses, but usage is not limited to such applications.
2. APPLICABLE DOCUMENTS:
The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent specified herein, The supplier may work to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has been canceled and no superseding document has been specified, the last published issue of that document shall apply.
2.1 SAE Publications:
Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.
AMS 2252 Tolerances, Low Alloy Steel Sheet. Strip, and Plate
MAM 2252 Tolerances, Metric, Low Alloy Steel Sheet. Strip, and Plate
AMS 2259 Chemical Check Analysis Limits, Wrought Low Alloy, and Carbon Steels
AMS 2301 Cleanliness, Aircraft Quality Steel. Magnetic Particle Inspection Procedure
MAM 2301 Cleanliness. Aircraft Quality Steel. Magnetic Particle Inspection Procedure, Metric (SI) Measurement
3.2.1 Sheet and Strip: Cold finished, bright or atmosphere annealed, and descaled if necessary, or hot rolled, annealed if necessary, and descaled, having hardness not higher than 98 HRB. or equivalent (See 8.2).
3.2.2 Plate: Hot rolled, annealed if necessary, and descaled. having hardness not higher than 25 HRC. or equivalent (See 8.2).
3.3 PropertIes:
The product shall conform to the following requirements: hardness and bend testing shall be performed in accordance with ASTM A 370:
3.3.1 Avera9e Grain Size: Shall be ASTM No. 5 or finer determined in accordance with ASTM E 112 (See 8.3).
3.3.2 Response to Heat Treatment: Product 0.875 inch (22.22 mm) and under in nominal thickness and thicker product reduced to 0.875 inch ± 0.010 (22.22 mm ± 0.25) in thickness shall have tensile strength not lower than 180.0 ksi (1241 MPa) or hardness not lower than 40 HRC after being hardened by quenching in oil from 1550 °F ± 10 (843°C ± 6) and tempered for not less than 30 minutes at not lower than 900 °F (482 °C).
3.3.3 Decarbunzation: Depending upon thickness of the product, decarburization may be measured by a HR3ON hardness step test method, or by the microhardness traverse method. Additionally, the metallographic method shall be used, in part (See 3.3.3.4.1), to inspect product 0.025 to 0.250 inch (0.64 to 6.35 mm) thick, and it may be used to inspect product with thickness 0.375 inch (9.52 mm) and over.
33.3.1 In the case of dispute, the microhardness method, conducted in accordance with ASTM E 384, shall govern. The allowance for decarburization shall be that which would have been applicable had the step method been used (See 3.3.3.4.1 or 3.3.3.5.1, as applicable.).
33.3.2 Specimens: Shall be full thickness of the product except that specimens from plate
0.250 inch (6.35 mm) and over in nominal thickness may be slices approximately 0,250 inch
(6.35 mm) thick cut parallel to and preserving one original surface of the plate. Recommended
minimum specimen size is I x 4 inches (25 x 102 mm). For product 0.025 to 0.250 inch (0.64 to
6.35 mm), a full cross section metallographic sample shall be prepared to inspect for presense of
complete decarburization (ferrite).
3.3.3.3 Procedure: Specimens shall be hardened by austenitizing and quenching: preferably, they shall not be tempered but, if tempered, the tempering temperature shall be not higher than 300 °F (149 °C). During heat treatment, specimens shall be protected by suitable atmosphere or medium or by suitable plating to prevent c.arburization or further decarburization.
3.3.3.4 Product 0.025 to 0.250 Inch (0.64 to 6.35 mm), Exclusive, in Nominal Thickness: Protective plating, if used to prevent any decarburization during hardening, shall be removed, and a portionof the specimen shall be ground with copious coolant to prevent thermal or mechanical effects toa depth of 0.050 inch (1.27 mm) or one-half thickness, whichever is less.